set up cf-691 to use --targetField

[kelloggm]

Sadly, it crashes :(

Merge with njit-jerse/specimin#247 @LoiNguyenCS

[kelloggm]

Local output:

Running specimin with this command: ./gradlew run --args='--root "/Users/mjk76/Research/code-review-verification/specimin-evaluation/ISSUES/cf-691/input/Issue691/" --outputDirectory "/Users/mjk76/Research/code-review-verification/specimin-evaluation/ISSUES/cf-691/output/Issue691/src/main/java" --targetFile "com/example/Collections.java"  --targetField "com.example.Collections.UnmodifiableNavigableSet#EMPTY_NAVIGABLE_SET" --jarPath "/Users/mjk76/Research/code-review-verification/specimin-evaluation/ISSUES/cf-691/input/Issue691/specimin/checker"'
cf-691 executing...
cf-691 execution ends.
Exception in thread "main" UnsolvedSymbolException{context='null', name='NavigableSet', cause='null'}
	at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.convertToUsage(JavaParserFacade.java:682)
	at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.convert(JavaParserFacade.java:740)
	at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.convert(JavaParserFacade.java:736)
	at com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserParameterDeclaration.getType(JavaParserParameterDeclaration.java:69)
cf-691 - FAIL
cf-691 <========= execution Ends.
HTML generated successfully.





issue_name    |    status    |  Fail reason  | preservation_status | preservation reason
------------------------------------------------------------------------------------------
(1)cf-691    |    FAIL     |    ISSUES/cf-691/cf-691_error.txt            | FAIL           |   Minimization did not succeed.

The full stack trace implicates:

	at org.checkerframework.specimin.UnsolvedSymbolVisitor.getArgumentTypesImpl(UnsolvedSymbolVisitor.java:2041)
	at org.checkerframework.specimin.UnsolvedSymbolVisitor.visit(UnsolvedSymbolVisitor.java:522)
	at org.checkerframework.specimin.UnsolvedSymbolVisitor.visit(UnsolvedSymbolVisitor.java:84)

[kelloggm]

@tahiat can you take a look at why this is failing CI? I may have made the field key a required key by accident.